The Name does matter!
Many people didn't buy the Wii U becasue they didn't know it's a new console.
They thought it was peripharel like Wii Fit and not a new console.
Another person here said that many people thought Wii is the real console and the Wii U is a fake :)
That's just shows how confusing that name is.
The names Wii and Wii U are simply too similar.
Either way that name caused a lot of confusion with costumers.
and also effected the sales.
I think that's the only reason the Wii U isn't successful as much as the Wii was.
I had no idea what Nintendo were thinking when they added the U to Wii U.
I hope that for their next console they would choose a good name.